diff --git a/pkgs/by-name/xr/xrootd/package.nix b/pkgs/by-name/xr/xrootd/package.nix
index 4ad8f2d7951e..626f6f5edc77 100644
--- a/pkgs/by-name/xr/xrootd/package.nix
+++ b/pkgs/by-name/xr/xrootd/package.nix
@@ -158,5 +158,6 @@ stdenv.mkDerivation (finalAttrs: {
     license = lib.licenses.lgpl3Plus;
     platforms = lib.platforms.all;
     maintainers = with lib.maintainers; [ ShamrockLee ];
+    mainProgram = "xrootd";
   };
 })